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参数资料
| 型号： | LTC3713EG |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-SSOP |
| 标准包装： | 59 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 90% |
| 电源电压： | 1.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LTC3713
APPLICATIO S I FOR ATIO
due to a dropping input voltage for example, then the
output will drop out of regulation. The minimum input
t DELAY =
1 . 5 V
1 . 2 μ A
C SS = ( 1 . 3 s / μ F ) C SS
V IN ( MIN ) = V OUT
V OUT = 0 . 8 V ? 1 + F 2 ?
voltage to avoid dropout is:
t ON + t OFF (MIN)
t ON
Output Voltage Programming
A resistor divider connected between V FB1 and V OUT sets
the output voltage according to the following equation:
? R ?
? R F 1 ?
External Gate Drive Buffers
The LTC3713 drivers are adequate for driving up to about
30nC into MOSFET switches with RMS currents of 50mA.
Applications with larger MOSFET switches or operating at
frequencies requiring greater RMS currents will benefit
from using external gate drive buffers such as the LTC1693.
Alternately, the external buffer circuit shown in Figure 5
can be used. Note that the bipolar devices reduce the
signal swing at the MOSFET gate.
When the voltage on RUN/SS reaches 1.5V, the LTC3713
begins operating with a clamp on I TH of approximately
0.9V. As the RUN/SS voltage rises to 3V, the clamp on I TH
is raised until its full 2.4V range is available. This takes an
additional 1.3s/ μ F, during which the maximum load cur-
rent is reduced. During start-up the maximum load current
is reduced until either the RUN/SS pin rises to 3V or the
output reaches 75% of its final value. The pin can be driven
from logic as shown in Figure 6. Diode D1 reduces the start
delay while allowing C SS to charge up slowly for the soft-
start function.
After the controller has been started and given adequate
time to charge up the output capacitor, C SS is used as a
short-circuit timer. After the RUN/SS pin charges above
4V, if the output voltage falls below 75% of its regulated
value, then a short-circuit fault is assumed. A 1.8 μ A cur-
rent then begins discharging C SS . If the fault condition
persists until the RUN/SS pin drops to 3.5V, then the con-
troller turns off both power MOSFETs, shutting down the
converter permanently. The RUN/SS pin must be actively
pulled down to ground in order to restart operation.
BOOST
INTV CC
The overcurrent protection timer requires that the soft-
TG
10 ?
Q1
FMMT619
GATE
OF M1
BG
10 ?
Q3
FMMT619
GATE
OF M2
start timing capacitor C SS be made large enough to guar-
antee that the output is in regulation by the time C SS has
reached the 4V threshold. In general, this will depend upon
Q2
FMMT720
SW
Q4
FMMT720
PGND
3713 F05
the size of the output capacitance, output voltage and load
current characteristic. A minimum soft-start capacitor can
Figure 5. Optional External Gate Driver
INTV CC
Soft-Start and Latchoff with the RUN/SS Pin
The RUN/SS pin provides a means to shut down the
LTC3713 as well as a timer for soft-start and overcurrent
3.3V OR 5V
D1
V IN
RUN/SS
R SS *
C SS
R SS *
D2*
RUN/SS
C SS
latchoff. Pulling the RUN/SS pin below 0.8V puts the
3713 F06
LTC3713 into a low quiescent current shutdown
(I Q < 30 μ A). Releasing the pin allows an internal 1.2 μ A
current source to charge up the external timing capacitor
(6a)
*OPTIONAL TO OVERRIDE
OVERCURRENT LATCHOFF
(6b)
C SS . If RUN/SS has been pulled all the way to ground,
Figure 6. RUN/SS Pin Interfacing with Latchoff Defeated
there is a delay before starting of about:
3713fa
15
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相关代理商/技术参数 |
参数描述 |
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| LTC3713EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3713EG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3713EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3714EG | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3714EG#PBF | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
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